7898987 has 4 divisors (see below), whose sum is σ = 7926240. Its totient is φ = 7871736.

The previous prime is 7898983. The next prime is 7898993.

7898987 is nontrivially palindromic in base 10.

7898987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7898987 - 2² = 7898983 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7898981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13187 + ... + 13772.

It is an arithmetic number, because the mean of its divisors is an integer number (1981560).

Almost surely, 2^7898987 is an apocalyptic number.

7898987 is a deficient number, since it is larger than the sum of its proper divisors (27253).

7898987 is a wasteful number, since it uses less digits than its factorization.

7898987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27252.

The product of its digits is 2032128, while the sum is 56.

The square root of 7898987 is about 2810.5136541209. The cubic root of 7898987 is about 199.1546570102.

It can be divided in two parts, 7898 and 987, that multiplied together give a triangular number (7795326 = T₃₉₄₈).

The spelling of 7898987 in words is "seven million, eight hundred ninety-eight thousand, nine hundred eighty-seven".